Cylinder-boring tool



May 25,1926. Y 1,586,500

` A. S. BACON ET AL l v(YYLINDER 'BORING TOOL -Filed April 20, 1921 l4 Sheets-Sheet l IN VEN TORS ART/1w? 6. BACON @'59 TTORNEY May 25 `1926.-

. A. s. BACON ET AL CYLINDER BORIN G TOOL Filed April 20, 1921 4 Sheets-Sheet 2 f lili! 4 N 0 me n m GA TTGRNEY May 25 1926.

' A. S. BACON ET AL CYLINDER BORING TOOL INVENToRs 0 ones umuewm waamco/v 'ATTORNEY F'iled April 20, 1921 4' Sheets-Sheet 3 May 25 ,1926.

A. S. BACON ET AL CYLINDER BORING TOOL Filed April 20, 1921 4 Sheets-Sheet 4 IN VEN TORS GEORGE W #06h/Solv ARTHUR BACON A TTOR NE Y Paten'tcl May 25, 1926.y

ABTHURCS. macon n y mimica-$151131@-vmpnimo, 1921.5

of the -clmmetey.deseplbeilg tegpr `ffl-he invention,eensists el;` .perlejamelv .melde .elewgitign 13111 pp slllprl oil. :a: .eylmden central, Verhaal,

, egaal; vease; "cured :to the upper: Lendfff fthe .cylnfcler 4in seal fNo. 462,922.

in f. Sect; n;` showingfth :movement aptel to. he cutting suring a concentric positioning thereof with relation to the bore of the cylinder is quickly accomplished by the centering cone or member shown, and even permits removal and replacement of the base member at any time if conditions should arise which would require temporary removal of the base. The size of the base member and the centering cone may of course be varied to suit cylinders of varying diameters.

The base member is provided as a support for the boring tool generally illustrated in Figs. 1 and 2. This tool consists of a cylindrical housing member B, on the lower end of which is formed an annular ,j flange 11. This flange is offset as at 12 to permit it to be received by the base member A, and it also permits automatic and instantaneous centering of the housing with relation to the base; any suitable means for securing the housing may be employed or as here shown ordinary cap screws 13.

Formed on kthe upper end of the housing B is a cylindrical enlarged casing section 14 and forming a cover therefor is an upper housing section 15. Disposed in the upper end of the housing section 15 is aV tapering split sleeve bearing 16, and similarly arranged in the lower end of the housing section B is a sleeve 17. The sleeves 16 and 17 are both threaded as at 18, and similarly the ends of the respective housing sections. Both sleeves are also provided with. round shaped heads or flanges 19 whereby the sleeve may be turned when adjustment is required, and castellations are preferably formed on both iianges 'to permit the sleeves or bushings to be locked in their adjusted positions by means of spring arms or latches 20. The respective sleeves or bushings shown form bearings for the cutting bar generally indicated at This bar extends through the respective housing sections and the bushings, and means is provided for rotating the bar and also for advancing it axially in either direction, the means employed being housed and entirely inclosed within the enlarged sect-ion 14. This mechanism in general consists of a worm gear 21, driven by means of a worm 22. The worm gear 21 is keyed to the cutting bar C, but as this is splined, it is obvious that longitudinal movement of the cutting bar will be permitted while rotary movement is transmitted means of the gear 21. The gear just referred to is positioned in the lower part of the enlarged housing section 14, and it is secured against vertical movement therein by means of an annular shoulder 23. Formed or otherwise secured on of the gear 21 is a bracket 24, and journalled in said bracket is a series lof shafts indicated at 25, 26, 27 and 28. Secured on the shaft 25, by a pin or other suitable .present instance formed in each circle.

to the same by` theV upper face means, is a star gear 29, see Fig. 6, and turnably mounted on the same shaft is a driving pinion 30 which intermeshes with a gear 31 secured on shaft 26. This shaft carries a pinion 32, which meshes with a gear secured on shaft 27. This shaft in turn carries a pinion 34 which meshes with a gear 35 secured on shaft 28. This shaft in turn carries a worm 36, which constantly meshes with a worm rack 37 cut or otherwise formed in one side of the cutting bar C. This rack extends a given distance of the bottom end to the top end of the bar as shown in Figs. 1 and 2, and the worm gear 36 intermeshing therewith is the means employed for imparting axial or longitudinal movement in either direction as will hereinafter be described.

Formed in the cover section of the upper housing 15 is a series of inter-spaced openings 38, each opening being lined with a bushing 39. Similarly formed is a second set of openings lined with bushings 40. These openings are arranged in a circle concentric with relation to the openings 39, and they are also equally interspaced as shown; there being eight openings in the Insertible in any one of these openings is a pin 41."This pin when inserted forms a stop member with which one of the teeth of the star wheel engages once during each revolution, and represents the slowest feed or advance imparted to the cutting bar. If it is'desired to double the speed of advance, it is only necessary to insert a second pin in the opening directly opposite as suoli insertion will impart two movements to the star wheel during one revolution of the cut ting bar and the gear 22. It' it is again desired to further increase the speed, more pins may be inserted as further revolutions or rotary movement will be imparted to the star gear. The turning movement of the star wheel is transmitted to the shaft 25, to which it is secured, and through a friction mechanism to be hereinafter described to the pinion 30. This pinion imparts a rotary movement to the gears 31, 32, 33, 34 and 35, and thereby imparts a rotary movement to the which finally advances the bar in one direction or another. Vertical movement is imparted to the bar in a downward direction when one or more pins are inserted in the inner circle of openings indicated at 39, while reverse or upward movement is transmitted tothe bar when pins are inserted in the openings 40 disposed in the outer concentric circle, that is it should be remembered that the gear 21` is constantly rotated in one direction by means of the worm pinion 22; further that the several shafts 25, 26, 27 and 28, together with the gears secured thereto, are journalled in the bracket worm pinion 3G,

nea-ey ineen-an member '24, which fini ltiirngis-4H siipported or securefdkltothe -igear "2L lill-fthe fgears car'- l tentlyiiotated"Wheneven engagenfijentis--niede pim is tenen op enin'g's 139, engagement '-is niedel -with ltlfie ott-openings made with Wheel land t'heinterniittjent `rotation thereof 25 elis' of v'consideialole inipor'teinee as sitf-niay ohviate lbreakage-f off the cutting tool, the cylinder`r orrthe-vzictiialtingmechanism if a solid obstruction-*oit any l natoire 1 is fencounteied. 1 'flhisiriction ldrive consists oit` anafcliiis'talble nut42 disposed Yon loWerend` sof 1the 'shaft VInterpo'sedl het-Ween ithe/'starA `wheel -29`^an`d-the driving: pinion() is a'.-tfriction'vvasherfi 'Disposed on fthe nopposite Ayside: of *the* driving pinion is La V'fri'tion p Washer 44, and disposedlhelovv rotate Whenevery a pin havegza ."tendencywito .igifveba ehfattening` 6151 p iiagged.cintriivitliinat @ic l tiene Which-should -f'ce'rt nlv 'llo'ea'void the same ,is 'a lloose Tk-loea'ring bushing 45, von thek other ssileifof which Ais Vplaced ar friction Washer 46,'1andkinterposedlhetvveen said frictionL "Washer ,and the; 'adjustable niit 42 is fahelical'springllf, which may vfloe coinpressed tofjanyfdegi-'ee rdesired v'ley ,the -adbut :slippage Will-take *place betvveen the shaft? 25y fand the driving pinion "50l throiih which the --sha'tt yentends if vfeiny solid o struction 'is encountered. In@othervvo'rds, the I ster Wheel', lend? shaft would continue to 4l is encountered,

hifit fino tiirning- /inovement lvvoiild be "-.transr invention iis'lthe provision of 'la V.flexibledriviiie'islia'it 48. This shaft fis attachedinany 22. 44"flheiopposite,fend ofthe-.shaft i8 may herconnected with Worm ing moveinent tto lthe 22 eindfvvithoiit tiiansniit'tiiig .any shocks; 1or vibrations ito the mechanism. driven stherehy as alhsuch shodks sork vibrations are absorbed initlie flexible shaft 48..` Suche driveis#exceed-y ingly Y i'iinpcriant fin @the present .instance :as transmitted fthivo ihv f anjvlfexteiriorA vibration the'wdifiving: nieohanisin here fsliown' i v in afne-borngitool, psiir'iiiciilarly. nflfien 'i sideredlitliiita reshoiiingior iifiiiiehingseiitcriten y reached. A lit 'fingono direction, Awhile if aff-pin is 'placed' Jifnltlie `@uterinost coneeritiicliei-rele `the1upward linovenient oit the Shar. opposite lend of 'tli'e' vivorinrack y nioreholesas.indicatedfat lgand n v tap VEone-or sideiafhle length,

not so umich-:diie ba'r litself springs, the thinning out-oi ting bar,

ein-electric niotoro'rother`v driving iiiiit .land as suoli transmits-1a tiiifnv in .lier welll; a

' amount n pronimately ithiiee y thon-siindths 'et @ein in iswsoiiinehthatfavariation-ot 'ef-venone or? .two

thoiissndths of lan lineh'fis dettinient'aflivto t lie itiv'el 4stopping laxial nioveinent ot ltheciitting i arl` when #extreme n n 1n fan lupward or -k downward direction l .fis

tnoler importainti:teatiireofthepresent4`V invention fi'sltlie provision jot ineens' for .pos-vl lli-initsf fof Amovement f Vllhi's is accomplished by 1 terniinatf the entreine flowery insert a fstopfscrew 52 itherein. j This screw the A Wey drill or engages "the toprthreadpf the Worin pinion j` V 3 6 'ivi/,hen limit ialiid "thnsfiseciiresor y against `fiirtherrotation 1 Automatic nieans lisv fthgus provided and of tappe@ holes as indicated. at* 5l, it

the bar reaches its extreme flower l'loc'ks the saine foryliniiting fthe-axialniovenie'nt ofthe'har, v

' Within @eXtreme/limits danger j of fin-j iiring the f machine 1 in one` Wa'yy yor another-is a oided.' Byp'roviding 1a ,plu-52 is .p'ossiblewto adjust .thegposition ofthe `stop Screw,andl-thusr'slightly increase the axial l movement of the har inentfinight he required.

f AAnother Viin'po" invention i is vthe kprovisionk ot #a cutting hail tantfeatiii'e ot'the present- Where rfurther move-g sie which [is capable Joli' producing .a koutZ from end fto endf'ot al cylinder i iin-iiorin in fdiaineter. v ln inost f horinginills Where .the cutting-toolisseeiired to tlfieioiiter endotlie han` land 'nhere the-:lout is. of con` .it generally happens that WhichiisYpositively ico have found .that

fthe Aoil ilin inlthe hear if Iinch Vwim ingslby Iwhich theficiitting :bar is supported, that lis as sideflpiessiii'ei increases fon= the out-lv .2a lever l Aaction ,fis rproduced 'n .which tendsfto isqueezekorpress the `oil iilni ont Eoi': the lovvermostrbea'ring, ffoi' instance that infdicated at f1?. f' To iis ,1 taglie carefoi` the :gira-dual 1 .troinfendto end. y jeeted `:fapproifiiina'tely eleven inches when making a cnt,

y In ith'e present linstaneeftlie' bar has a. longitudinal movement 'or is 'pro-- y f hatisfieleven inchesfrepre vsente eipproiin'iately .the extreme travel off thefbrforl'theridistance hichthetool-fliold# ing lend'iof theihar travels-downwardly with relation 1to1 the-ghe' ating 115. This por'tion fof theV gh a'r lis itaperedi-oni tlijej point indicated at 60 .for 70 tol'the 'Sextrenie filowerendl; ,they

oi irednetenrin 1 diameter being gap l ,lesk

one and one-half ythousandths orn an inch on each side. In actual operation we will suppose that the end oi"l the bar is projected approximately one inch beyond the end of the bearing 17 whenv the cut in the cylinder is started. If this is the case, there would be a play of one and one-halt thousandths of an inch radially inall directions within the bearing 17 as the bar has been reduced that much in diameter at the lower end. In other words,` the bearing would contain an oillin one and one-hall one-thousandths of an inch yin thickness. Thisiihn is easily maintained when the bar is onlyprojected a slight distance as the pres sure on the tool small, but as the bar gradually moves in a downward direction side pressure on the bearing increases and the oil iilm which was originally one and one-halil one-thousandths off an inch will naturally have a tendency to squeeze out or become thinner. I f the bar had a constant diameter, it is obvious that In other words,

.a certain amount of side play would take place, but as the bar gradually tapers in the present instance, it can be seen that no side play will take place. For instance when the bar begins to reach its extreme limit or projection, the clearance between the bar and the bearing, due to the tapering oi the bar, is practically taken up, andas the oil lilm has gradually'reduced in thickness, due to the side pressure exerted during the projection oi the bar, it can be seen that no side play will be permitted. In other words, we have discovered that it is not the spring in the bar which causes gradual decrease in the diameter of a cut, but it is the thinning out of the oil iilm in the bearing which causes the gradual decrease in diameter towards the end of the cut. Such thinning out of the iihn is permitted in this case, but as the bar graduallyvincreases in diameter to correspond to the thickness of the oil film, it is obvious that no side playv will be permitted.

In actual operation if it is desired to rebore a cylinder, it is only necessary to place the base member A on the top of the cylinder as indicated in Fig. 5, and to center the same by inserting' the-centering cone l0'. The base is then secured by the rods 6 Aand the screw nuts 8. The centering cone is then removed and the housing proper placed in position on the base; the housing being secured by is of course assumed that the cutting tool indicated at 8O has been applied and that it is in position to start the cut within the cylinder. Power may now be transmitted through the iexible shaft 4- 8 and vibrations from an exterior source are thus eliminated as such vibrations are taken up in the ilexible shaft. Rotation of the worm 22, which is directly connected with the liexible drive shaft, causes rotation of the mainv driving is then` comparatively inserting the 'cap screws 13. It

gear 2l. rIhis in turn rotates the cutting bar C and the feeding mechanism supported by the gearlfl. rIhis mechanism? is actuated by one or more pins .tl placed in the inner circle when the bar is to be extended in a downward direction, that is once or more the star wheel 29 is more of the pins 41 and a is thereby transmitted to the connected gear train during each revolution engaged by one or partial revolution the star wheel and generally shown in Fig. drives the worm 36 which engages the worm rack 37 formed directly on the bar. An axial and a rotary movement is thus trans-y mitted to the bar and thecutting tool is thus advanced through the cylinder. No attention is required during the cutting operation as the bar will be automatically stopped against further axial movement when the cut has been completed, due to the provision of thestop screw 52. Wlhen the operator inds that the cut has been completed, he merely removes the pins l1 from the inner circle and inserts the same in the outer circle. In 'act every hole in the outer circle may be plugged or a pinion inserted therein during the reverse movement as it is naturally desired to retract the bar as quickly as possible after thelirst cut has been made. No particular attention is required during the return movement ofthe bar as it will automatically be stopped when the upper end oi its travel is reached, due to the fact that the spiral `ack is stopped ott as indicated at 50. Upon making thenishing cut, the pins are again shifted to the innermost circle and the bar is again advancedin a downward direction. When this cut has been completed, one or more pins are plugged inthe outer circle and the bar is then slowly withdrawn or raised to finally complete the vtinishhig cut.

It during the cutting operation, it is found necessary to stop the cut, for instance if it should be desired to start another cylinder, it is accomplished by releasing the cap screws 13 and removing the housing. If an extra base ring may be had it is obvious land the base already applied left in-place.

In that case it is obvious that re-centering of the base member will beunnecessary when the housing is again placed in position. However, if the operator should only be in possession of a single base member, it is obvious that it can be readily re-centered by the centering cone 10.

Vhile certain features of the present invention are more or less specifically illustrated, we wish itnnderstood that `various changes in form and proportion may be resorted to within the scope of the appended claims, similarly that the materials and finish of the several parts employed may be such as the experience and judgment of t, which `in turn .25 confined Within .the h direction, said pin when disposed in one of the. openings of the outermost circle imparting a reverse movement to the star wheel, means for transmitting movement of the star Wheel to the Worm, and a friction drive in said connection. 9. In a tool of the character described, a housing, a boring bar longitudinally movable in the housing, a driving member confined inthe housing, and surrounding the bar and splined to the latter, means Within the housing for securi-ngsaid driving mem ber against longitudinal movement in the housing, a bracket confined Within the ousin'g and carried by the driving member and means carried by the driving' member and having connection with the bracket and operable for feeding the bar longitudinally in either direction.' v

10. In a tool of the character` described a housing, aboring bar revolvably and longitudinally movable in said housing, means in the housing forlrotating the bar, means the housing', and includinlg friction driven means carried by the rotating means for imparting a longitudinal movement thereto, adjustable means at one end of the bar for limiting the longitudinal movement thereof in one direction,

and fixedmeans at the lopposite'end of the bar for limiting longitudinal movement thereof in the opposite direction.

y11. In a toolof the character described a housing, a boring bar revolvably and longitudinally movable in said housing, means confined Within the housing for rotating the bar, means carried by the rotating means and confined Within the housing for imparting a `longitudinal movement thereto, a plurality of tapped holes in one end of the bar, a stop screwr insertible therein to limit the longitudinal movement of the bar in one direction, and means on the opposite end of the bar for limiting the Vmovement of the bar in the opposite direction.

12, In a tool of the character described, a

housing, a boring bar rotatably and longitudinally movable 1n the housm'g, a driving member confined in the housing and surrounding the bar and splinedto the latter, means for securing the driving member against longitudinal movement in the housing, a bracket secured at one of its ends to the driving member and confined Within o-using, a plurality of shafts between lthe bracket and the driving member, a driving pinion journalled in the housing and operatively connected to the driving member, a train of gears confined Within the housing and connecting the aforesaid shafts, and a star Wheel connected to one of said shafts for'actuating the train of gears toeffect an intermittent operation ofthetrain ofvgears.

13.' In a tool of the' character described,

a housing, a boring bar rotatably and longitudinally movable in the housing, a driving member surrounding the bar and splined thereto, means for securino said 'driving member against longitudinal movement in the housing, an arcuate shaped bracket confined Within the housing and carried by the driving member and means carried by the driving member and o-peatively disposed between the same and said bracket andv operable for feeding the bar longitudinally in either direction.

1.4. In a tool of the character described, a housing, a boring bar rotatably and longitudinally movable in the housing, a driving member surrounding the bar and splined thereto, and being confined -Within the housing, means for securing said driving member against longitudinal movement in the housing, an arcuate shaped bracket confined Within the housing' and carried by the drivin'g member, means carried by the driving member and disposed between the same and said bracket and operable for feeding the bar longitudinally in either direction, and means for feeding` means.

15. In a cylinder boring tool, a. housing, a boring bar mounted in the housing, a gear on the bar and splined thereto and confined Within the housing, `means for rotating the gear and bar, andmeans confined Within the housing for transmitting a longitudinal movement to thek bar during rotation of the bar, including a' Worm confined Within the housing and operatively engaging the bar and a train of gears carried by the first mentioned 'gear and confined within the housing and operatively connected with said Worm.

16. A cylinder boring tool con'iprising a housing, a boring bar extending through the housing, a gear on the bar and splined thereto, means for imparting a rotary movement to the lgear and bar, means for imparting a longitudinal movement to the bar during rotationthereof including' a Worm arranged in parallelism With t-he bar and operatively engaging the same, and a train of gears also mounted on the first mentioned gearing and operatively con` nected to the Worm for actuatmg'the latter.

17. A tool of the character described comprising a base, a housing removablyattached thereto, a vertically disposed boring bar revolvably and longitudinally movable in said housing, a horizontally disposed gear Wheel splined to said'fbar, means for holding said gearvvheel against axial move.- ment, means for rotating said*l gear Wheel, and means carried Wholly by said gear Wheel over the upper flat face thereof for feeding said bar longitudinally. f L 18. A tool of the character described comintermittently operating said upper flat face prising a' base,

a housing removably .attached thereto, a l

bar revolvably and longitudinally movable in said housing, a horizontally disposed gear Wheel spliiied to said-bar, means for holding said gear Wheel against axial movement, means for rotating said gear Wheel, means carried Wholly by saidgear Wheel over the thereof for feeding said bar longitudinally, s and means carried byA the Wheel adjacent thefeed means-and actuable for intermittently operating said feed means. 19; A tool of the character described comprising a housing, a vertically disposed borloiigitudinally moving bar revolvably and a horizont-ally disable in said housing,

`.posed gear Wheel splined to said bar, means to prevent axial move-ment of said. gear Wheel, means for rotating said gear Wheel, means carried kby said gear wheel over the upper flat face thereof for lonoitudinally, means a eratiiig said feed means,

` and means for varying the interval of operation lof said` intermittent feed operating means.

20. A tool of the character described coiny prising a an engine cylinder,

basey adapted to be clamped upon from saidbase, a boringbar revolvably and f axially movable in `said housing, a Wheel splined to said bar, means for li-olding'said Wheel against axial movement', a vfeed mechanism confined Within said :housing and mounted on the upper face of saidwheely for causing axial movement of said bar in either direction Whensaid wheel. is rotated,

means for rotating said Wheel and means for varying theV operation -of' said feed mechanism. A

22. A tool of the character described coiny vertically disposed boringr feedingsaid barrfor intermittently opa housing` extei'idingl f. from said base, a from said base,a boring bar revolvably and y axially movable in said housing,` a Wheel Y holding vsaid a feed mechn 7fsplined to said bar,

meansinovable from placeto place fromthe outside of base adapted/to be clamped upon ivheel against axialy movement, a feedanechanisni revolvable 1Svith said Wheel, and abutinents shift-able from one place to another on the'outside ofsaid'housing and project- `ing into the housing for regulating" the -1 amount ofy feedof said feed mechanism.

" A tool of thechaifacter described comprising a baseadapted to kbe clamped upon an"` engine cylinder, a yhousing extending yfrom said base, a boringbar'revolvably and "axially movable *ink said housing, a Wheel splinedr to said bar, means for holdingsaid Wheel against axial movement, teeth on said bar, La threadedworm revolvably mounted oiisaid Wheel and engaging the teethr on said bar, a drive for said Worm including a star Wheel, i and 'pins extending through said housing for kengagement by said star Wheel. y f

2.4i. Atool of the character described coinprising a vhase adapted to be clamped upon an,V engine cylinder, 'a housing extending boring bar revolvably and axially movable "in", said housing, a Whee.

y iiieansfor holding Wheely againstk axial movement, teeth formed on said bar, a ythread d Worin mounted onfsaid Wheel, a gear train driving said. Worm, frictional engagement With ythe driving pinion of said gear train, and pins adjustable ksaid casing-for engageinent With said star Wheel.

i 25. n a tool of the character described,a housing, a bo-riiig barrotatably and longitudinally movable in the "housing, a driving gear entirelyenclosed kWithin the housing and surrounding ,the bar and splined to the latter, means for .securing said driving inem- 3er" against longitudinal movement` housing, and a gear. mechanism confined enfor tirelyy Within `the ,housing and carried Wholly ybythe gear to feedthebar longitudinally vin eitherdirection. f

terrines; Bacon said revolvably a star yWheel held inv formed yin they y l e i i GEORGE Wanueiisou. i 

